Type-writing machine.



J. P. FORKARTH. TYPE WRITING MACHINE.

APPLICATION FILED JAN.18, 1906.

986,229. Patented 001:. 5, 1909.

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[Wm/(ML a. Mwa/M J. r. PORKARTH.

TYPE WRITING MACHINE.

APPLIUATION FILED JAN.18,1906

Patented Oct. 5, 1909.

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wiwssas.

J. F. FORKARTH.

TYPE WRITING MAGHINE.

APPLICATION FILED JAN. 1a, 1906.

936,229. Patented 0011.5,1909.

3 SHEETB-SHEET 3.

w nas'sas. fwevzfor JOSEF FRANZ FORKABTH, INNSBRUCK, AUSTRIA-HUNGARY, ASSIGNGR TO FEHDINAN SCHREY, E BERLIN, GERlVLiNl I'.

rYrn-wnmnve MACHINE.

5936,2259. Specification of Letters Patent. p e wg @gt, 5., gong,

Application tiled January 18, 1906. Serial No. 296,893.

To all 71:71.01 it may concern:

Belt known that l. Je si Fnaxz Fenn- Au'ru, u'citizen of the Empire of Austriallungary, and resident of lnnshrucli, in the Empire of iiustria-Hnngary, have invented a certain new and useful improvement in Type-Writing Machines, of which the following isa specification.

My invention relates to in'iproveinents in type-writing machines in which special keys and connected mechanism are provided for alternately releasing the platen carriage and arresting the same after it has performed sliding movements of a predetermined extent greater than the distance from one tooth of the usual rack to the next, and the objects of my improvement are first to provide a lahulator mechanism in which the release of the feed wheel of the platen carriage is effected in a novel manner and by improved means, and second to reduce the force of theblow imparted by the released platencarnage to the arresting mechanism when performing a comparatively large I jump. I attain these objects by the mechan-' ism illustrated in the accompanying drawings in which- Figure l is a partly broken plan view, with certain parts omitted, showing my improvement as applied to a type-writing machine of the Hammond type. Fig. 2 is a corresponding rear end elevation with certain parts broken and others omitted. Fig.

3 is a detail of a brake mechanism shown in end view and in side View. Fig. at is a side view of the same mechanism as seen from the opposite side, with parts'omitted. Fig. 7 is an elevation of one of the tabulator keylorers and certain mechanism cooperating lherewit h, the said leverbeing shown broken. Fig. 6 is a detail of'a stop or rider for arresting the movement of the platen carriage. soon in end view and side view. Fig. 7 is a side view and plan of a lever'mechan ism to he referred to. Fig. 8 is a detail of the n'ieohanism for imparting an oppositestep by step movement. to the platen carriage.

The mechanism constituting nzy invention lS'SllQWXl 1n the drawings, and will hereinmiter he described, as applied by way 01" example to a typoqvriting machine oi. the

wr-ll lmownllammoud type; T wish it to he understood, however, that I do not limit my invention to its application tothis pari'ulcrumed at, or suspended from, apart 3.

A comb-shaped sprin 5 normally holds the forward or shorter ever'arms depressed, thereby maintaining the longer arms, which are provided with suitable keys, in the raised position.

Above the shorter arms of the said hey levers is disposed a shaft 6 provided, on the one hand, with a yoke I and, on the other hand, with a special arm or lover 8 having a key at its free end. A spring 9 tends to rotate the said shaft (3 in such a direction as to maintain the yoke 7 with its transverse portion 10 in engagement with the shorter arms of the key-levers l and, at the same time, to keep the keyed arm or lever 8 in the raised position. The shaft 6 also carries an arm 11 which-in addition to the usual smcing key not particularly shown in the rawing-acts to operate the hammer locking device of the llammond type-writing machine.

The construction and arrangement of the usual lever mechanism for releasing the platen-carriage feed-wheel of the Hammond machine is according to my present inven' tion modified in the following manner: As

shown in Figs. 2 and 7 the shorter end of the lever 12 18 provided with a rectangular .On, the axis of this lever 12 is mounted an auxiliary lever 13 carrying two sto s 14 for limiting the extent of movement or the said lever 13 relatively to'the lever 12. A sprin 16, secured at its one end to the lever 12-1111 pressing with its other end against a pin 15 on the auxiliary lever 13 acts to normally retain the latter in the position shown in Figs. 2 and 7. that is to say, in that position in which the lfl\\"(l'HH)Sl1l) Il0(YFiilWlVHl stops 1-1 is in engagement- Wilhthe lover l2. 'lho auxiliary lover- 3 ar to'rol nse the hnin mer of the llannuond machine and is normally operated by the main releasing lever 12 acting on the lowermost stop l-l of the v aid auxiliary lever and depressing the same at its right hand end. The said auxiliary lever may. however, also be operated independently ol the main releasing lever. This occurs when the arm ti' rigidly secured to the yoke T (as shown in Fig. 2) is raised by the upward movement of the said yoke and on its part raises the lower end 1.8 of the said releasing lever 19. in such case the movable pawl controlled by the upwardly extending bifurcated portion. of the said le ver 12 (amt shown in Fig. 2 as engaging a tooth ot the teed-wheel) will be withdrawn from engagement with the feed-wheel, without at the same time eansing the bent end portion of the main l't leasing lever l2 to engage the teeth of the teed-Wheel, as would otherwise be the case. This action is due to the free play provided between the upper stop It and the upper engaging surface on the righthand arm of the lever 12. The teed-wheel will then be entirely released and tree to rotate at. will. The force of the movement thus imparted to the platen carriage is reduced by the following means: The side portions of the platen carriage are provided with arms 19, the free ends of which support the bar 20. This bar is provided at its upper and lower edges with teeth, the spacing of the latter corresponding exactly with the extent of the step by step movements of the platen earriage from one letter to the next.

Suitable detachable stops or riders 21, shown in side and end vi av in Fig. (5, may be attached to the toothed bar 20, in the manner shown'inl igs. 2 and at distances apart corresponding with the jumps to be performed by the platen carriage when the tabuletor is used. inch of these stops or riders consists of a Hat piece. of metal having a lower hooked portion and an upper projection 28 and ot' a flat spring 2.) attached thereto at. its lower end by screws, as shown or otherwise. The said spring is, substantially of the same shape in lateral outline as the flat piece of metal, being only without the lower hooked portion and having at ornear its upper end a lateral angnlar extension or book 24. By reason of a certain taper in the sectional shape of the tlat piece: of metal the upper end of the Hat spring normally extends somewhat away from, and out of eontaet with, the corresponding end surface of the said piece of metal, as will be seen from Fig. 6. In applying the said stops or riders to the toothed bar the operator inserts the lower hooked portion 22 into the respective interstice ol the lower teeth of the bar 20 and then places the upper projeetion 23 as well as-the lmok-shaptal end 24; of its tlat spring 23 into the interstiee bet-ween the correspending two upper teeth of the bar 20, whereupon the said hooked end ot the spring will engage the rear face of the adjoining tooth. in the movement of the platen earriage the said stops or riders will pass immediately above the end portions 2 of the tabulator key-levers 1, so that when one of these lever ends has been raised by the ope-rator having depressed the respective key the next tt)l) or rider arriving at the raised lever end will engage therewith and the platen carriage will become arrested in this position.

the movement of the released platen 'arriage continues. its feed-wheel attains a certain impetus which it is desirable to specially counteract to a certain extent, seeing that the said teed-wheel is not integral with the )inion 2a which engages the toothed bar of tilt platen earriage. This effected by the following means: The plate. st, in which the ends '2 of the tabnlator key-levers 1 are guided. is made capable of a limited longitudinal sliding movement, the spring 27 tending to retract the said guide plate 4 into its normal positioin will be seen from Figs. 1 and 2, the guide plate ,t is provided with an arm 30. having a laterally projeet-- ing end portion '39 which is in such position relatively to the teeth ot' the teed-wheel as to allow .the teeth of the latter to barely pass the end '25 ot' the. said arm 30 without coming in contact therewith in the rotation of the feed wheel. When the operator depresses a tabnlator l\'t\' and when one of the stops or riders strikes the raised lever end 2, the guide plate 4; is carried along a short distance against the action of the spring 27, the end 31) ot the arm 30 being thereby brought into the line of movement of the teeth of the teed wheel so as to prevent t'urther rotation of the latter. Upon the tabulator ke v being no longer depressed the end 2 of the respective ke lever l returns to its lower position. thereby becoming disengaged t'rom the stop or rider the arm tit) is withdrawn trom the teeth ot the l'eed wheel and the latter thereby released as well. .\t the same time the platen carriage moves forward a slunt'distatn-e. until the Feed wheel is again stopped in the usual manner by the movable pawl engaging with the teeth of the said wheel in consequence of a correspotnling movement of the auxiliary releasing lever 13.

Since the. movement of the platen carriage when eompletely released would he excessively rapid and the shock resulting from its sudden stoppage rather severe. l provide for a certain braking action to thus 't'urther reduce. the toree ot the movement o't the platen carriage when the tabulator keys are being used. To this end the Feed wheel carries a drmn it which is partly snrrounded by a brake band 32, the ends of the latter being suitably secured on the brake, lever 33% by pins or otherwise, as shown in Fig. at. The brake lover 81L fulcrumed on the screw 23 carries at its one end as a flat spring 37 the free outer end of which extends below a set sc v 38. It will thus be seen that the said spring will tend to 50 tart the brake lever as to cause the brake to he appliet. The tension of the spring 37 may be varied by means ofthe set screw 238 so that thus rendered possible to adjust the braking effect as required. The arm 39 ol the brake lever 3 t extends with its outer end ll) below a hook l-1 provided on the yoke 7, as will be seen from Figs. 1 and 5.. his hook -11 norn'ially engages the end 40 of the brake lever 8t to restrain the spring 3? from exerting its tension and thereby causing the brake to be applied, and when the hook it is raised to release the end 40 of the brake lever the latter is so moved by the spring 3? as to apply the brake action. Thus, when any one of the tabulator keys or the key on the arm S is depressed, the said hook ell will allow the brake l ver 3t to move upward any one of the above named keys is no longer depressed the said hook ll will draw the brake lever Ill downward thereby releasing the brake.

The etl'eetof the braking action upon the movement of the platen carriage in the normal step by step movement of the carriage during the regular operation of writing, that, is to say when the tabulator is not actually used, is so moderate, provided that the gearing is properly dimensioned, as not in any way to reduce the speed of operation in w riting.

The usual llamniond machine is enerally provided with a mechanism by means of which the platen carriage may be given a step by step movement in a direction opposite to that in which it generally travels. This so-called return key mechanism as heretofore constructed consisted of a comparatively large number of parts. Thus, the transi nission ot the movement, by means of which the platen carriage is to be made to travel in the opposite direction, from the return key unto the pinion 26 which engages with the rack bar of the platen carriage, heretofore necessitated the employment of a second pinion continually engaging the pinion 26; and on the axis of this second pinion there was provided a ratchet Wheel carrying on its axis a pawl engaging with the said ratchet wheel. In addition to these parts the following other parts were employed: two springs, a key-lever, a universal joint and a connectingpart.

According to my present invention the improved return key mechanism consists, only of the t'ollowing parts; a keylever 53 ot' the arrow shown in Fig. 8 and the pawl at is moved to the left. The free end of this pawl being drawn upward by the spri'ig 59 into contact with the pin (30 thereby made to engage the tccthot the'wheel 2G, rotating the latter to the extent (it one tooth. Another spring then raises the key, so that upon the operator \vitlalrawing his linger from the key. the parts named will return ino their position of rest, the pawl be ing withdrawn from engagement with the teeth ot the wheel '26. .The peculiar mode ot arrangement of the spring 59 causes the pawl to be pressed firmly into engagement with the teeth of the wheel 2o, thus absol itely preventing any failure in the operation ot the mechanism.

The labulator mechanism described posvarious in'iportant advantages as compared with similar mechanisms heretotforc known. lormcd in a single piece throughout their entire length, that is to say. from the end which bears the key to the other end which acts upon the mechanism tor arresting the movement of the platen carriage, and the keys are operated in a downward direction, the same as the regular writing keys; these two :ulvantagcs being here secured by the tact that the k eys and their levers are mounted in the hotto n portion of the machine and that the toothc'l bar to which the detachable stops or riders are applied is located comparatively .ow in the machine. in the usual talmlator mechanism heretofore known the key-liners generally consisted of a number of jointed p: rts, this having been found necessary in ord r to provide for a downward direction of movement of the keys. To my improved construction the brake mechanism is very reliable and etlicient in its operation by reason of the fact that I employ a band brake, which provides a more yielding, action and reduces the Wear to some extent. This improved braking device also admits of a very fine adjustment.

.h'lorcover, it is indirect in its action and not positive, the brake band being normally maintained in its inoperative position by the tabulalor mechanism and being automatically applied when a tabulator key is acted upon. The movable plate t acts in neutralizes the greater part of the shock The tabulat'or kev lcvcrs are each the manner of a cushion which receives and due to the sudden jump of theplaten carriage. Another feature of merit in my improved construction consists in that the keyed arm or lever 8 and its connections 6, 7 and 9 may be employed as a special means, either in addition to the usual releasing mechanism or in substitution? therefor, for

releasing the platen carriage:

What I claim as my invention, and desire to secure by Letters Patent, is:

1. The combination in a type-writer, of a bar havin detachable stops thereon, a number of ta ulatorlevers, a movable guide plate actuated by the said levers, means for returning the said guide plate into its position of rest, and means, on said guide plate for engaging the platen-carriage feed-Wheel when the guide plate is moved out of its position of rest.

2. The combination in a type-writer, of a bar having detachable stops thereon, a number of tabulator levers, a movable guide plate receiving the rear ends of the said evers, a spring tending to return the said guide plate into its posltion of rest, and an arm on said guide plate mounted to engage the platen-carriage feed-Wheel when the guide plate is moved against the action of itsv spring.

3. T he combination in a type-Writer, of a number of tabulator levers, a drum mounted on the axis of the platen-carriage feed-Wheel, a brake band extending partly around said drum, an operating lever engaging said brake band, actuating means tending to turn said lever into the operative position, and means controlled by the tabulator levers in 1 their position of rest for normally retaining the brake operating lever in its inoperative position contrary to the action of the actuating means.

4. The combination in a type-writer, of a number of tabulator levprs, a drum mounted on the axis of the platen-carriage feed -vvl1eel, a brake band extending partly arouhdsaid drum, an operating lever engaging said brake band, a spring tending to turn said lever into the operative positlon, means for adjusting the tension of said'spring, and means controlled by the tabulator levers for retaining the brake operating lever in its inoperative position contrary to the action of said spring in the position of rest of the tabulator levers. k

"5. The combination in a type-Writer, of a;- bar, detachable stops thereon, a number of' tabulator levers, a slidable guide plate actuated by said levers, a spring for normally retaining said guide late, an arm .on said guide plate for engaging the platen-carriage teed-Wheel, a drum on the axis of said platen-carriage feed-wheel, a brake band embracing said drum, an operating lever engaging said brake band, a spring for ac-' tuating said lever, a set screw for varying the tension of said spring, and a hook controlled by the tabulator levers for retaining the brake operating lever inits inoperative position.

JOSEF FRANZ roRKARTH.

Witnesses Unvssns J. BYWATER, MATHJLDE K. HELD. 

